TY - JOUR
T1 - The physicochemical and catalytic properties of clay extrudates in cyclization of citronellal
AU - Vajglová, Zuzana
AU - Simakova, Irina L.
AU - Eränen, Kari
AU - Mäki-Arvela, Päivi
AU - Kumar, Narendra
AU - Peurla, Markus
AU - Tolvanen, Stiina
AU - Efimov, Alexander
AU - Hupa, Leena
AU - Peltonen, Jouko
AU - Murzin, Dmitry Yu
N1 - Funding Information:
The authors are grateful to Academy of Finland for funding through the project: Synthesis of spatially controlled catalysts with superior performance. Electron microscopy samples were processed and analyzed at the Electron Microscopy Laboratory, Institute of Biomedicine, University of Turku, which receives financial support from Biocenter Finland . The authors are grateful to Mark Martinez-Klimov for the pH measurements. I.S. is grateful for the support from the Ministry of Science and Higher Education of the Russian Federation , under the governmental order for Boreskov Institute of Catalysis (Project No. AAAAA21-121011390055-8 ).
Publisher Copyright:
© 2021 The Authors
PY - 2022/1/5
Y1 - 2022/1/5
N2 - Four clay materials, namely, bentonite, bleaching earth, attapulgite and sepiolite, were shaped into the cylindrical body by extrusion. Clays were characterized in depth by TEM, SEM-EDX, N2 physisorption, pyridine FTIR, pH measurements, contact angle measurements, 27Al MAS NMR, and the crush test. Catalytic properties were investigated in the citronellal cyclization as a model reaction. The reaction was performed in the trickle-bed reactor at 70 °C, 10 bar of Ar with 0.086 M initial citronellal concentration in cyclohexane. The best results were obtained over attapulgite with isopulegols yield of 24% and stereoselectivity to the desired isopulegol isomer of 61%. Attapulgite had the highest meso-to-micropore volume ratio, the highest basicity, a low Brønsted-to-Lewis acid sites ratio, and the lowest amount of Brønsted acid sites compared to other extrudates. In addition, same clay exhibited the highest mechanical strength of extrudates.
AB - Four clay materials, namely, bentonite, bleaching earth, attapulgite and sepiolite, were shaped into the cylindrical body by extrusion. Clays were characterized in depth by TEM, SEM-EDX, N2 physisorption, pyridine FTIR, pH measurements, contact angle measurements, 27Al MAS NMR, and the crush test. Catalytic properties were investigated in the citronellal cyclization as a model reaction. The reaction was performed in the trickle-bed reactor at 70 °C, 10 bar of Ar with 0.086 M initial citronellal concentration in cyclohexane. The best results were obtained over attapulgite with isopulegols yield of 24% and stereoselectivity to the desired isopulegol isomer of 61%. Attapulgite had the highest meso-to-micropore volume ratio, the highest basicity, a low Brønsted-to-Lewis acid sites ratio, and the lowest amount of Brønsted acid sites compared to other extrudates. In addition, same clay exhibited the highest mechanical strength of extrudates.
KW - Attapulgite
KW - Bentonite
KW - Citronellal cyclization
KW - Clay
KW - Extrudates
KW - Palygorskite
KW - Sepiolite
UR - http://www.scopus.com/inward/record.url?scp=85118892091&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2021.118426
DO - 10.1016/j.apcata.2021.118426
M3 - Article
AN - SCOPUS:85118892091
SN - 0926-860X
VL - 629
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
M1 - 118426
ER -